Ralink RT2880 User Manual page 79

Since the Intermediate Queueing (IMQ) pseudo device are used to support Ralink SW
QoS, it must be enabled first, or some needed options in Netfilter configs won't show up due
to dependency.
Networking --->
Device Drivers --->
Network device support --->
<*> IMQ (intermediate queueing device) support
IMQ behavior (PRE/POSTROUTING) (IMQ AB)
(2)
Kernel Netfilter configs:
In order to support Ralink SW QoS, several necessary Netfilter modules are used, including
Netfilter match and target modules. These modules must be enabled to let Ralink SW QoS
work correctly. But first of all, a proprietary Ralink option in Netfilter has to be enabled.
To completely fit the requirement of Ralink SW QoS some changes are made in Linux
Netfilter architecture. For this changes, a Ralink proprietary Netfilter option Netfilter Ralink
SWQoS support is introduced. This Ralink proprietary Netfilter option must be enabled to
support Ralink SW QoS, or the classification of IP address may not work properly. If the Ralink
SW QoS is not required, of course, it is recommended to leave this option blank to keep the
Linux Netfilter architecture unchanged and expected.
-> Networking
-> Networking support (NET [=y])
-> Networking options
-> Network packet filtering framework (Netfilter) (NETFILTER [=y]
-> Core Netfilter Configuration
[*] Netfilter Ralink SWQoS support(Marking after NAT)
Then please enable the following necessary netfilter and iptables modules to support Ralink
SW QoS:
Number of IMQ devices
Page 79 of 93
RALINK AP SDK 3.3.0.0 User's Manual